Brown sulfur dye.



, way: Ten pounds of para nitrosophenol and NITED STATES PATENT OFFIGE.

ARTHUR ASHWORTH AND JOSHUA BURGER, OF BURY, ENGLAND.

BROWN SULFUR DYE.

SPECIFICATION forming part of Letters Patent No. 653,278, dated July 10, 1900.

Original application filed May 8, 1899 serial No. 716,068, Divided and this application filed November 7,1899. Serial No. 736,098. (No specimens.)

To all whom it may concern: 4

Be it known'that we, ARTHUR ASHWORTH and JOSHUA BURGER, of Bury, England, have invented a new and useful Improvement in Coloring-lvlatters, of which the following is-a specification.

We have found that the compounds obtained by Liebermanns reaction--that is, by the action of nitrosophenols on phenols in the presence of sulfuric acid-yield under certain treatment valuable coloring-matters capable of dyeing vegetable fibers black and brown shades from an alkaline bath.

As an example how to produce a black coloring-matter we proceed. in the following forty pounds of phenol are mixed with twenty pounds concentrated sulfuric acid. After the reaction is over one hundred pounds of caustic-soda solution of 80 Twaddell are added and then thirty pounds of finely-ground sulfur mixed with it. The whole mass is heated for several hours to 180 centigrade until the reaction is completed. The color thus produced dyes from an alkaline bath on vegetable fibers greenish-blacks, which 011 oxidation with bichromate of soda and sulfuric acid or similar oxidizing agents are converted into deeper blacks of great fastness. The alkaline salts of the color are soluble in water, insoluble in ether, slightly soluble in hot alcohol, and the free color-that is, the color precipated by mineral acids from its alkaline salts-is insoluble in water. The proportions and temperatures above given may be varied.

As an example how'to produce a brown coloring-matter we proceed in the following way: Seventeen and one-half pounds of beta nitrosonaphthol and forty pounds of phenol are mixed with twenty pounds of concentrated sulfuric acid. After the reaction is similar oxidizing agents are converted into deeper browns of great fastness. The alkaline salts of the color are soluble in Water, insoluble in ether, slightly soluble in hot alchol, and the free colon-that is, the color precipitated by mineral acids from its alkaline 5 5 salts-4s insoluble in Water. The proportions and temperatures above given may be Varied.

The present application is a division of an application filed by us May 8, 1899, Serial No. 716,068.

. What We claim as new is- As new products the coloring-matters derived from the products obtained by the action of sulfuric acid on nitrosophenol and phenol and known as Liebermanns bodies, and produced by subsequent treatment of these bodies with caustic soda and sulfur, dyeing cotton from an alkaline bath black to brown shades, the alkaline salts of the color being soluble in Water; insoluble in. ether; slightly soluble in hot alcohol, and the free color precipitated from its alkaline salts by mineral acids, insoluble in water.

In testimony whereof we have signed our names to this specification in the presence of two subscribing Witnesses.

ARTHUR ASHWORTH. JOSHUA BURGER,

Witnesses:

JOHN WILLIAM THOMAS, ERNALD SIMPsoN MosELnY. 

